HP 8590 E-Series, Calibration Manual

Page: 386 / 693

56. Non-Harmonic Spurious Outputs , HP 8591EM Option 010
16. V erify that the marked signal is not the fundamental or a harmonic of the
fundamental by performing the following steps:
Note that the following steps are for an HP 8566A/B microwave spectrum
analyzer , the steps may be dierent if you are using another microwave
spectrum analyzer .
a. Divide the marker frequency by the fundamental frequency (the EMC
analyzer center frequency setting). F or example , if the marker frequency
is 30.3 MHz and the fundamental frequency is 10 MHz, dividing 30.3 MHz
by 10 MHz yields 3.03.
b. Round the number calculated in step a the nearest whole number . In the
example above , 3.03 should be rounded to 3.
c. Multiply the fundamental frequency by the number calculated in step b .
F ollowing the example , multiplying 10 MHz by 3 yields 30 MHz.
d. Calculate the dierence between the marker frequency and the
frequency calculated in step c above . Continuing the example , the
dierence would be 300 kHz.
e. Due to span accuracy uncertainties in the microwave spectrum analyzer ,
the marker frequency might not equal the actual frequency . Given the
marker frequency , check if the dierence calculated in step d is within
the appropriate tolerance:
F or marker frequencies <5 MHz, tolerance = 6200 kHz
F or marker frequencies <55 MHz, tolerance = 6750 kHz
F or marker frequencies >55 MHz, tolerance = 610 MHz
f. If the dierence in step d is within the indicated tolerance , the signal
in question is the fundamental signal (if the number in step b = 1) or a
harmonic of the fundamental (if the number in step b >1). This response
should be ignored.
17. V erify that the marked signal is a true response and not a random noise
peak by pressing SINGLE to trigger a new sweep and press PEAK SEARCH.
A true response will remain at the same frequency and amplitude on
successive sweeps but a noise peak will not.
If the marked signal is not the fundamental or a harmonic of the
fundamental (see step 16) and is a true response (see step 17), proceed with
step 20.
P erformance V erication T ests 2-357